Set-iterator-remove-1.js

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// A set iterator can cope with removing the current entry.

function test(letters, toRemove) {

    var set = new Set(letters);

    toRemove = new Set(toRemove);

    var leftovers = [...set].filter(x => !toRemove.has(x)).join("");

    var log = "";

    for (let x of set) {

        log += x;

        if (toRemove.has(x))

            set.delete(x);

    assertEq(log, letters);

    var remaining = [...set].join("");

    assertEq(remaining, leftovers);

test('a', 'a');    // removing the only entry

test('abc', 'a');  // removing the first entry

test('abc', 'b');  // removing a middle entry

test('abc', 'c');  // removing the last entry

test('abc', 'abc') // removing all entries